Reaction of Metals with Water or Steam

Q.

A solution of a substance X is used for white washing. Name the substance X and write its formula. Write the reaction of the substance X named in above with water.

Q.

A compound ‘A’ is used in the manufacture of cement. When dissolved in water, it evolves a large amount of heat and forms compound ‘B’. $\left(\mathrm{i}\right)$ Identify A and B. $\left(\mathrm{ii}\right)$ Write the chemical equation for the reaction of A with water. $\left(\mathrm{iii}\right)$ List two types of reaction in which this reaction may be classified.

Q. Question 2 (i)

Write equation for the reaction of iron with steam.

Q.

Explain reaction of metal oxides with acids and bases.

Q.

The most acidic oxide among the following is

1. ${\mathrm{N}}_2{\mathrm{O}}_5$

2. ${\mathrm{P}}_2{\mathrm{O}}_5$

3. ${\mathrm{NO}}_2$

4. ${\mathrm{N}}_2{\mathrm{O}}_4$

Q.

what is the reaction of a non-metallic oxide with base?

Q. Why are metal oxides basic and non - metallic oxides acidic in nature?

Q. All of the following metals react with steam, except

1. 
   Cu
2. 
   Al
3. 
   Zn
4. 
   Fe

Q.

Which of the following are basic oxides?

${\mathrm{Mn}}_2{\mathrm{O}}_7,{\mathrm{V}}_2{\mathrm{O}}_3,{\mathrm{V}}_2{\mathrm{O}}_5,{\mathrm{Cr}}_2{\mathrm{O}}_3,\mathrm{CrO}$

Q.

What happens to metal oxide when reacted with water?

Q. Question 2 (ii)

Write equation for the reaction of calcium and potassium with water.

Q.

Hydrogen reacts with calcium to form calcium hydroxide.

1. True
2. False

Q.

Which metal does not react with water at all?

Q.

Name the following:

a. A metal which reacts with steam evolving hydrogen gas.

Q. Question 5
Which of the following oxide(s) of iron would be obtained on a prolonged reaction of iron with steam?

(a) $\text{FeO}$
(b) ${\text{Fe}}_2{\text{O}}_3$
(c) ${\text{Fe}}_3{\text{O}}_4$
(d) ${\text{Fe}}_2{\text{O}}_3$ and ${\text{Fe}}_3{\text{O}}_4$

Q.

Which among the following statements is incorrect for magnesium metal?

1. It burns in oxygen with a dazzling white flame.

2. It reacts with cold water to form magnesium oxide and evolves hydrogen gas.

3. It reacts with hot water to form magnesium hydroxide and evolves hydrogen gas.

4. It reacts with steam to form magnesium hydroxide and evolves hydrogen gas.

Q.

Explain why sodium hydroxide solution cannot be kept in aluminum containers and also write an equation for the reaction that may take place for the same?

Q.

An element A reacts with water to form a compound B which is used in whitewashing. The compound B on heating forms an oxide C which on treatment with water gives back B. Identify A, B, and C and give the reactions involved.

Q.

Question 42
When a metal X is treated with cold water, it gives a base Y with molecular formula XOH (Molecular mass = 40) and liberates a gas Z, which easily catches fire. Identify X, Y and Z and also write the reaction involved.

Q. Which of the following metal react vigorously with cold water?

1. Zinc (Zn)
2. Sodium (Na)
3. Magnesium (Mg)
4. Aluminium (Al)

Q. The acid formed when sulphur trioxide reacts with water is

1. Sulphuric acid
2. None of these
3. Both (a) and (b)
4. Sulphurous acid

Q.

Two ores X and Y were taken. On heating these ores it was observed that (a) ore X gives ${\mathrm{CO}}_2$ gas, and (b) ore Y gives ${\mathrm{SO}}_2$ gas. Write steps to convert these ores into metals, giving chemical equations of the reactions that take place.

Q.

70. Mention the general methods of preparation of CO₂ along with the chemical reactions.

Q.

How does aluminum metal react with water? Write a balanced chemical equation.

Q.

Answer the following question:

The gas used as reducing agent in reducing copper oxide to copper.

Q.

(a) Write one reaction in which aluminium oxide behaves as a basic oxide and another in which it behaves as an acidic oxide.
(b) What special name is given to substances like aluminium oxide?
(c) Name another metal oxide which behaves like aluminium oxide.

Q. Which of the given metals exhibits both reactions (a) as well as (b)?

(a) Metal + Oxygen $\to$ Metal oxide

(b) Metal + Cold water or hot water or steam $\to$ Metal hydroxide + Hydrogen

1. Magnesium (Mg), iron (Fe), sodium (Na), and copper (Cu)
2. Magnesium (Mg), zinc (Zn), platinum (Pt), and gold (Au)
3. Sodium (Na), potassium (K), magnesium (Mg) and calcium (Ca)
4. Copper (Cu), magnesium (Mg), gold (Au), and sodium (Na)

Q.

Oxides of metals are basic while those of non--metals are acidic. Explain with example.

Q.

From amongst the metals sodium, calcium, aluminium, copper and magnesium, name the metal
(i) which reacts with water only on boiling, and
(ii) another which does not react even with steam.

Q.

Why metal oxide are bases without carrying hydroxide ions